A GSM module or a GPRS module is a chip or circuit that will be used to establish communication between a mobile device or a computing machine and a GSM or GPRS system.
The humidity sensing component of the DHT11 is a moisture holding substrate with the electrodes applied to the surface. … The DHT11 converts the resistance measurement to relative humidity on a chip mounted to the back of the unit and transmits the humidity and temperature readings directly to the Raspberry Pi.
A relay is an electromagnetic switch operated by a relatively small electric current that can turn on or off a much larger electric current.
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